问题 填空题

(4分)已知:C(s)+O2(g)  CO2(g)       ΔH="-437.3" kJ·mol一1

H2(g)+O2(g)  H2O(g)    ΔH ="-285.8" kJ·mol一1

CO(g)+O2(g)  CO2(g)    ΔH ="-283.0" kJ·mol一1

则煤的气化主要反应(碳和水蒸气反应生成一氧化碳和氢气)的热化学方程式是

                                                                               

答案

(4分)C(s) + H2O(g)  CO(g) + H2(g) ΔH=131.5 kJ·mol-1(热化学方程式状态漏写或反应热错均不得分)

①C(s)+O2(g)  CO2(g)       ΔH="-437.3" kJ·mol一1

②H2(g)+O2(g)  H2O(g)    ΔH ="-285.8" kJ·mol一1

? CO(g)+O2(g)  CO2(g)    ΔH ="-283.0" kJ·mol一1

①+(-②)+(-?),得C(s) + H2O(g)  CO(g) + H2(g) ΔH=+131.5 kJ·mol-1

点评:考查热化学方程式的相关计算;

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